Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Heulandite Subgroup from
Stewart Hartshorn Quarry (Hartshorn Quarry), Millburn, Millburn, Essex County, New Jersey, USA


Locality type:Quarry
Classification
Species:'Heulandite Subgroup' (not an IMA approved species)
Formula:(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Heulandite Subgroup data
Locality Data:Click here to view Stewart Hartshorn Quarry (Hartshorn Quarry), Millburn, Millburn, Essex County, New Jersey, USA
Data Identifiers
Mindat Occurrence Record ID:80189
Long-form Identifier:1:3:80189:8
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
3.3km (2.0 miles) ⓘHoudaille Quarry (Summit Quarry; Commonwealth Quarry), Springfield, Springfield Township, Union County, New Jersey, USA
4.0km (2.5 miles) ⓘHartshorn Quarry, Short Hills, Millburn, Essex County, New Jersey, USA
10.9km (6.8 miles) ⓘFanwood Quarry (Weldon Quarry), Watchung, Somerset County, New Jersey, USA
12.5km (7.7 miles) ⓘF.J. Marley Quarry, Verona, Essex County, New Jersey, USA
14.3km (8.9 miles) ⓘMontclair, Montclair, Essex County, New Jersey, USA
15.3km (9.5 miles) ⓘWilson's Quarry (Wilson Stone Co. Quarry), Watchung, Somerset County, New Jersey, USA
16.1km (10.0 miles) ⓘMcDowell's Quarry (Osborne and Marsellis Quarry), Upper Montclair, Montclair, Essex County, New Jersey, USA
18.7km (11.6 miles) ⓘLaurel Hill, Secaucus, Hudson County, New Jersey, USA
18.9km (11.8 miles) ⓘFrancisco Brothers Quarry, Great Notch, Little Falls Township, Passaic County, New Jersey, USA
19.1km (11.9 miles) ⓘHoudaille Quarry, Little Falls Township, Passaic County, New Jersey, USA
References
Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.93
 
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